Where are you getting the specific idea that they're ignorant of 2600? Is it something they've said, or just because of their general disregard for what one might hesitantly call tradition?
Sorry, I should have been more specific on this point - I was on my original draft, and I forgot to put it back in.
If you read through lulzsec's twitter, they entered a petty dispute with someone who hung out on a channel on the 2600 irc server. So they DDoSed 2600 as a whole and began to issue posturing tweets towards 2600.